Mechanical movement.



R. H. PIETZSCH & W. HURLEMAN.

MECHANICAL MOVEMENT.

APPLICATION man DEc.3.1912.

1,23 1,062. Patented June 26, 1917.

UNITED sTATEs PATENT oEEIoE.,

EICHAEEH. rIETzscH, or PHILADELEHIA, PENNSYLVANIA, AND WALTEEHUELEMAN, 0E GAMDEN, NEW JERSEY.

' M EcHANrcAL MOVEMENT.

' Camden, State of New Jersey, have invented an Improvement in Mechanical Movements, of which the following is a specification:

The 'object of our invention is to provide a construction of mechanical movement for converting continuous rotary movement into intermittent rotary movement such asis required for intermittently feeding photo@ graphic films in that class of machines employed in moving picture exhibitions, the device being so constructed that the means for locking the intermittently rotated part in 'fixed position between veach movement is independent of the means for-imparting the rotary impulses, vwhereby wear of the means .fo-r imparting the intermittent movement will not cause 'lost motion or permit of vifbtration of the driven part. By providing for the locking of the driven part for the period between each forward movement, by

means independent of the'means which imparts the intermittent movement, very great accuracy of movement may be had, andy when employedin a moving pic-ture machine, much of the vibration lof the image will become eliminated. 7

, While our invention is especially adapted for use in moving picture machines, we do not confine its use to any particular use, b-ut refer to this as an example of its special vutility as in such machines great accuracy is desirable to insure proper superimposing of the images and avoidance of objectionable vibration. y

Our invention consists of certain features of construction which 'are fully described hereinafter and more particularly dened in the claims. Our improvements will` belA better understood by reference to the drawings, in which z- Figure 1 is a perspective view of a 4mechanical movement embodying our vinvention; Fig. 2 is a front elevation ofthe same with the drivingand driven shafts broken away; Fig, 8 is a transversesection on line m-w' of Fig. 2, illustrating detailsof the driving cam drum; Fig. 4 is an elevation Specification of Letters Patent. Patented une 26, 1917; Application lled Decem'er 3, 1912. Serial No. 734.669. v A

corresponding to Fig. 2, but showing a modied form of our invention; and Fig. 5 I

-is a -cross section-n line g/-g of Fig. 4 illustrating the surface formation of the driving cam drum. l j

2 is the continuously rotating or power shaft; and 3 is the intermittently rotated or driven shaft. The driven shaft 3 isl intermittently rotated from the continuouslyrotating driving shaft 2 by mechanical devices which embody our improvements and will now be described. Secured to4 the ldriven shaft 3 is a wheel 4 which is provided with four slotted portions 6 in its periphery, said slotted portions being equally spaced about the perimeter of the vwheel. The circumferential surface of this 8, said drum having a curved circumferenf tial face-9 .and .inclined guide edges `10 kat-` each side thereof. Thiscamdrum 8 is'further provided with a cam: groove 12 arranged transversely and obliquely to its outer face at one place in its circumference, and said cam groove blending into .the inl clined guide edges 10 by the curved portions 13 and 14.- "[n addition to the parts just described, the cam drum 8 is further provided with a radial llocking ange 19 extending circumferentially around it at its middleA portion with the exception of a shortpdistance on each side of the transverse cam groove 12, lsaid locking flange terminating at its ends20 lwitha. more or less pointed or knife-delged shape; and it isalso-provided with the cam portions 15 an'd 16, as extensions df'the inc-lined guide edges 10 of. the drum, the cam l15 being arranged upon the drum on the side opposite to the en- Y trance'part of the cam groovel2, and the cam 16 -being upon the side of the drum opposite to that having.y the part 14 ofthe cam groove12..

By reference to Fig.2, itwill be seen that the driven wheel 4 fits theouter surface of the drum and has two of its radial pins 5 in operative relation with the opposite inclined los edges l0 of the drum 8. It will also vbe observed that the radial locking flange 19 snugly lits the slotted portion 6 of Wheel 4 which is intermediate of the two radial pins aforesaid. In this way, the wheel 4' is doubly locked against rotary movement, but the accuracy for holding the wheel 4 against the slightest rotary. motion is dependent upon the radial locking flange 19, and its engagement with the slotted portion 6. The pins 5, while held against movement in either direction, need not make a tight fit with the inclined edges 10, but coperate with said edgesgmore for the purposeof causing the pins to be properly actuated by the cam groove 12, 13, 14, when the drum 8 is rotated. Still referring to Fig. 2, it will be seen that if the drum 8 be rotated so that the c'am groove 12 is moving upward, the

part 13, leading to the cam groove, will be brought into contact with the left-hand pin 5 at the same time that the right-hand pin 5 is reached by the cam 15. At this same moment, the end 20 of the radial locking flange will have passed beyond and out of the lower slot 6 of the wheel 4, and -thereby unlocked it. A further movement of the cam drum 8 will, by the action of the cam 15, cause the wheel 4 to be slightly rotated to bring the left-hand pin 5 into complete engagement with the cam groove 12, and a continuation of this motion will cause the cam groove 12 to so operate upon the pin 5 that a quarter of a revolution will be given to the wheel 4 and its shaft 3 before the other end 20.of the radial locking flange 19 is brought intolocking engagement with the next or left-hand slot 6 of the wheel 4. As soon as this takes place, the wheel 4 is positively locked against any vibration, and the drum 8 may be given almost a full revolution before the neXt intermittent action is given to the wheel 4, this latter movement being a repetition of the one just described. 1t will be observed that the operative portion of the cams 15 and 16 upon the pins terminates shortly after it begins, as the object is only to require the pins to properly enter the cam slot 12, but I have also shown these cam portions 15 and 16 extended so as tc provide cam portions 18 and 17 respectively, the same actin as cams upon the pins 5 to assist or positively insure the. pins entering the cam groove 12. It will be seen by reference to Fig. 2 that if the cam drum is rotated as before, the left-hand pin 5 will enter between the parts 13 and 17 and be positively forced to enter the cam groove 12 at the same time that the right-hand pin is being actuated by the cam 15 toassist in such entrance of the left-hand pin. As the' parts are drawn, the drum 8 may be rotated in either direction to intermittently rotate the shaft 3 in one direction or in the. oppositeV direction, as may be required. It is manifest, however, that if the only one direction of rotation is required,-the cam 16 and the part 18 may be omitted, if so de- 'tioning of the drum, and we therefore do not restrict ourselves in this respect. It is equally evident that while only one of the cam grooves 12 and its associated parts are employed, any number of these parts may be used if so desired, as the more of them the more rapidly will the intermittent movements be imparted to the shaft 3 for a givenv number of revolutions of the shaft 2. As shown, one revolution of the shaft 2 imparts one intermittent movement to the shaft 3, but it is evident that the drum 8 may be of any size and have as many duplications of the parts shown as desired, so that one revolution of the shaft 2 may make any number of intermittent movements of the shaft 3 that may he desired, said changes in no way affecting the general construction and principle of operation of our invention. In thc particular illustration in Fig. 1, we have shown the intermittently driven shaft 3 as provided with a sprocket drum 7 which is that portion of a moving picture machine which imparts an intermittent feeding motion to the picture film, but we in no way limit our invention to use in connection with such' drum, as the driven shaft 3 may be employed for any ordinary purpose where a positive and accurate intermittent rotary movement is required.

In Figs. 4 and 5, we have shown a modified form of our invention, in which, instead of the slots 6 in the periphery of the wheel 4, we provide ribs 6, and instead of employing the radial locking flange 19 on the cam drum 8, we show a circumferential locking groove 19a widened on each side of the cam groove 12, as indicated at 19". This is practically a reversal of the parts 6 and 19 of Fig. 2, and it operates in the same manner, but in this case the clearance spaces 19h must be provided to allow the projections 6a to move transversely when the pin 5 is being operated by the cam groove 12. The depth lof these grooved portions will be clearly understood by reference to Fig. 5, the same being taken on line z-y of Fig. 4. It is 1also to be understood that while the outer circumference of the drum 8 is more or less grooved, as at 9, to fit the curvature of the perimeter of the wheel 4, this is not at all necessary to the operativeness of the invention. It is, however, preferable from a me- Pws'aid'wheel."Inotherwords, the radial flange yeo , 5 19 does not act in any manner to produceva rotary motion of the wheel 4 or its shaft 3, and for this reason, we refer to it as being means independent of the means for imparting the rotary impulses, and it is because 20 of this particular means that the wear upon the pins and radial flanges 10 will not in any way interfere with the steadiness of the shaft 3 and its wheel 4 when thelatteris in locked position under the control of the radial ange 19. As the radial ange 19 always revolves in the same plane, it is evident that very little wear will come uponsit or the sides of the slot 6 of the wheel 4.l and as the wheel may be made of harlened steel and the radial flange maybe of equallyhard material, it is evident that these parts will coperate for ,an exceedingly long time without any material wear such as would pro- Y duce objectionable lost motion. The wedgeshapedends 20 of the radial locking flange insures the accurate entering into the slots and removes any possibility of accidental binding of the parts.

While the construction shown in Figs. 1, 2 and 3 is that which we have preferred in practice, we do not limit ourselves to the details, as these may be modified without departing from the spirit of the invention.

Having now described our invention, what we claim as new and desire to secure by Letters Patent, is z- 1. In a mechanical movement for converting continuous rotary motion into intermittent rotary motion, the combination of a ro- 50 tatable driving shaft, a rotatable driven shaft, a drum on the driving shaft having a transverse cam on its periphery arranged obliquely to the axis of the shaft and also having a circumferential guide extending about the drum except adjacent to that portion having the cam, and a wheel on the `driven shaft having radial portions about its perimeter for engaging the cam of the drum and also having a guide portion in its perimeter intermediate of the radial portions for engaging the circumferential guide of the drum to intermittently lock the driven shaft and its wheel against rotation.

2. In a mechanical. movement for converting continuous rotary motion into intermittent rotary motion, the combination of a rotatable driving shaft, a rotatable driven shaft, `.a drum on the driving shaft having a transverse cam groove arranged obliquely to the aXis of the shaft andhaving a cam projection relatively positioned with respect tothemeiitrance Vend of the cam groove, and a wheel secured to the driven shaft having a plurality of radial pins arranged to respectively be acted upon by the cam groove and cam projection and in which the cam projection acting upon one pin causes a rotation of the wheel to bring a pin thereof into engagement with the cam groove, and locking means separate from the cam portions and pins for locking the driven shaft and its wheel against movement when the cam groove is not acting upon the pins.

3. In a mechanical movement for converting continuous rotary motion into intermittent rotary motiorT, the combinationofta ro tatable driving shaft, a rotatable driven shaft, a drum on the driving shaft having a transverse cam groove arranged obliquely to the .axis of the shaft and with one Wall extended to provide a circumferential entrance into the groove and having a cam projection relatively positioned with respect to the entrance end of the cam groove but on the side of the drum most distant from the entrance of the cam groove, and a wheel secured to the driven shaft having a plurality of radial pins arranged to respectively and simultaneously be 'acted upon bythe cam groove to start the rotation of the Wheel and whose further rotation is accomplished by the cam groove, and locking means separate from the cam portions and pins for locking the driven shaft andits wheel against movement when the cam groove is not lacting upon the pins.

4. In a mechanical movementifor converting continuous rotary motion into intermittent rotary motion, the combination of a rotatable power shaft, a rotatable driven shaft, a drum on the power shaft having a transverse cam groove therein, and also having a circumferentially inclined guide edge forming a continuation of said cam groove, a locking' flange radially disposed on said drum and partially encircling said drum, a

wheel secured to the driven shaft having a` member, comprising a peripherally grooved l wheel provided with chamfered edges and having a slnuous channel connecting said edges, an elevation on each edge of said wheel having an inclined portion leading from said chamfered edge to the top thereof, said incline being opposite and in alinement with the openings into said channel, a driven member adapted to rotate in the plane of the axis of the driving member, radial pins extending from the periphery thereof and adapted to bear on said chamfered edges, and means located between the pins of the driven Inember and chamfered edges of the driving member to hold the driven member from movement except at predetermined intervals.

6. In a mechanical movement a driving member, comprising a disk having chamfered edges and provided with a sinuous groove extending across the face thereof, a

driven member comprising a disk adapted' to rotate in the same plane as the axis of the driving member, radial pins extending from the periphery of the driven member and adapted to contact with the aforesaid cham- -fered edges and means for causing said pins to enter said groove said driving and driven members being further provided with locking means consisting of a circumferential guide rotating with the driving member and a longitudinal guide rotating with the driven member and coacting with the circumferential guide for holding the driven member vagainst rotary movement at times when not being rotated.

7. In a mechanical movement a driving member, comprising a disk having chamfered edges and a circumferential, peripheral groove and provided with a sinuous groove connecting said edges, a driven member comprising a disk adapted to rotate in the plane of the axis of the driving member, radial pins extending from the periphery of the driven member and adapted to contact said chamfered edges and to be engaged by said sinuous groove and means for causing said pins to enter said sinuous groove, said driving and driven members being further provided with locking means consisting of a circumferential guide rotating With the driving member and a longitudinal guide rotating with the driven member and coacting with the circumferential guide for holding the driven member against rotary movement at times when not being rotated.

8. In a mechanical movement a driving member, comprising a peripherally grooved wheel provided with chamfered edges and having a sinuous channel connecting saidv edges, an elevation on each edge of said Wheel having an inclined portion leading from said chamfered edge to the top thereof, said incline being opposite and in alinement with the openings into said channel, a driven member adapted to rotate in the plane ofthe axis of the driving member, radial pins extending from the periphery thereof and adapted to bear on said chamfered edges, said driving and driven members being further provided with locking means consisting of a circumferential guide rotating with the driving member and a longitudinal guide rotating with the driven member and coacting with the circumferential guide for holding the driven member against rotary movement at times when not being rotated.

9. The combination of a driving member and a driven member disposed at right angles thereto, the driven member being provided with radial pins, the driving member having inclined bearing faces against which said pins are adapted to bear, said faces lying in planes parallelwith the axes of the pins bearing thereon, a'sinuous groove extending across the periphery and opening on said bearing faces, a radial elevation on each edge', inclines leading to said elevation and adapted to cause the pins to enter said groove, said driving and driven members being further provided with locking means consisting of a circumferential guide rotatv ing with the driving member and a longitudinal guide rotating with the driven member and coacting with the circumferential guide for holding the driven member against rotary movement at times when not being rotated.

In testimony of which invention, we hereunto set our hands.

RICHARD H. PIETZSCH. WALTER HURLEMAN. Witnesses:

R. M. HUNTER, R. M. KELLY. 

